- Free medical Journals https://www.freemedicaljournals.com/
- Directory of open Access Repositories https://www.opendoar.org/
- BASE – Bifeld Academic Search Engine https://www.base-search.net/index.php
- SSRN- Social Science Research Network https://papers.ssrn.com/sol3/DisplayAbstractSearch.cfm
- OAIster https://oaister.on.worldcat.org/discovery
- ABC – Chemistry Directory of full text Journals in Chemistry https://www.abc-chemistry.org/
- Directory of open Access Journals https://doaj.org/
- Selected Open Access Journals https://www.icast.org.in/ejournal/ejournal.php
- RePEc https://repec.org/
- Registry of open Access Repositories https://roar.eprints.org/
- Science Direct- Open Access https://www.sciencedirect.com/browse/journals-and-books
- Open Access Journal Search Engine https://www.oajse.com/